In a department store there are 120 customers, 90 of whom will buy at least 1 item. If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item.
5 answers
Pr=(90/120)(89/119)(88/118)(87/117)(86/116)
the answer the book is 243/1024
Great, we agree. Put (90/120)(89/119)(88/118)(87/117)(86/116) in your google search window.
90/120)(89/119)(88/118)(87/117)(86/116
0.227
1 answer